What causes a low degree of vacuum concentration operation is

From: VacuumFamily.COM News Centre Add Time: 2015/1/19 15:32:00

What causes a low degree of vacuum concentration operation is

Concentration operation when the degree of vacuum is low, the temperature rise will cause the separator, i.e., a secondary steam temperature increases, the boiling point of the concentrated milk also will increase, thereby reducing the effective heating temperature difference between steam and milk, reduced heat transfer, reduced level of evaporation rate, while the milk is at a higher temperature, will affect the degree of denaturation of milk proteins, directly affect the quality of the product. Therefore, we must look for the reasons to be addressed in a timely manner. Causes of low vacuum roughly the following:

(1) enrichment equipment components of air leakage and infiltration of the vacuum degree of decline, such as the lid, manhole, depending on the hole, light hole, condensers, vacuum pipe pumping, piping materials, access to materials valve, a feed pump, secondary steam gasket leaking pipes and other parts, or the device itself leaks.

(2) Although the cooling water inlet temperature to meet the requirements, but its lack of traffic.

① use tap water or reservoir occasions, into the pump, although normal, but a sudden drop in water pressure itself, or reservoir fluid level drops, the pump intake valve opening degree of the original import pipeline, has been unable to meet require the original flow should be adjusted in a timely manner.

② cooling water intake pump or pipe partial obstruction.

(3) the use of the heating steam pressure than normal, prompting increased milk vaporization, secondary steam generated by not fully condensed.

(4) cooling water inlet temperature is too high, the cooling water inlet temperature during operation is one of the main parameters must be strictly controlled and regulated. On the use of hydraulic ejector enrichment equipment, the cooling water inlet temperature should be controlled at 25 ~ 30 ℃, but due to weather conditions or with the use of recycled water is unreasonable, the cooling water inlet temperature far exceeds the temperature limit. Generally the south, in the hot summer outdoor temperature up to 35 ℃, water or river water temperatures have been more than 30 ℃. In this case, the concentrated water discharge condenser apparatus, despite cooling tower, but can not be tap water or water with a temperature of more than 30 ℃ after mixing device as a concentrated cooling water, or affect the degree of vacuum.

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